.\" zip_source_window_create.mdoc -- create zip data source overlay
.\" Copyright (C) 2021 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP archives.
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.Dd July 31, 2025
.Dt ZIP_SOURCE_WINDOW_CREATE 3
.Os
.Sh NAME
.Nm zip_source_window_create
.Nd create zip data source overlay
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft zip_source_t *
.Fn zip_source_window_create "zip_source_t *source" "zip_uint64_t start" "zip_int64_t len" "zip_error_t *error"
.Sh DESCRIPTION
The
.Fn zip_source_window_create
function create a zip source from an underlying zip source,
restricting access to a particular window starting at byte
.Ar start
and having size
.Ar len .
If
.Ar len
is \-1, the window spans to the end of the underlying source.
.Pp
.Fn zip_source_window_create
doesn't take ownership of
.Ar source .
The caller is responsible for freeing it.
(This is different to other layered sources.)
.Sh RETURN VALUES
Upon successful completion, the created source is returned.
Otherwise,
.Dv NULL
is returned and the error code in
.Ar error
is set to indicate the error.
.Sh ERRORS
.Fn zip_source_window_create
fails if:
.Bl -tag -width Er
.It Bq Er ZIP_ER_INVAL
.Ar src
is
.Dv NULL ;
there is an integer overflow adding
.Ar start
and
.Ar len ;
or
.Ar len
is less than \-1.
.It Bq Er ZIP_ER_MEMORY
Required memory could not be allocated.
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_source 5
.Sh HISTORY
.Fn zip_source_window_create
was added in libzip 1.8.0.
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt wiz@gatalith.at
